OS Menu Bars

The menu bars of the operating system are visible when I run the OpenGL applications. How do I get rid of them?

You need to edit the screen.xml file, that defines the location(s) and other parameters of the graphics window. Inside this file, there is a parameter fullscreen. Setting this to ´1, enables full-screen mode:

<fullscreen type="int">1</fullscreen>

See also: Configuration files.
OS X-users, see also: OS X troubleshooting.